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Subject: Tablebases and 50 moves rule

Author: Michael Schmolei

Date: 07:13:38 09/14/01


In the 4th matchgame between Chess Tiger 14.0 (Lokasoft-GUI) and Fritz 6 of my
tournament it came to this position:



[d] 8/3B4/1B2nk2/8/5pK1/8/8/8 w - -

after 95. Bc8 Chess Tiger says an unbelievable mate in 72!!

the rest of the game:
95. Bc8 Ke5 96. Ba7 Kd6 97. Kf5 Nc7 98. Kxf4 Nd5+ 99. Kf3 Ke5
100. Bb7 Nc3 101. Ke3 Nd5+ 102. Kd3 Nf4+ 103. Kc4 Ke6
104. Bb8 Kf5 105. Bc6 Nh5 106. Kd4 Nf6 107. Bg2 Ke6
108. Bh3+ Ke7 109. Ba7 Nd7 110. Kd5 Nf6+ 111. Ke5 Kf7
112. Bd4 Ne8 113. Bf5 Nf6 114. Bc2 Ne8 115. Bb3+ Kg6
116. Kf4 Ng7 117. Kg4 Ne8 118. Bc2+ Kf7 119. Kg5 Ke6
120. Bb3+ Kd6 121. Bf2 Nc7 122. Bg3+ Kc6 123. Ba4+ Kb6
124. Kf5 Nb5 125. Bf2+ Ka5 126. Bb3 Kb4 127. Be6 Kc3
128. Ke4 Kb4 129. Bg8 Nd6+ 130. Kd5 Nc4 131. Bf7 Kc3
132. Bd4+ Kb4 133. Bf6 Nd2 134. Bg6 Nf3 135. Bd8 Nd2
136. Bh4 Kb3 137. Kc5 Nf3 138. Bf6 Ng1 139. Bh5 Kc2
140. Kd4 Kd2 141. Bg5+ Ke1 142. Ke3 Kf1 143. Bg4 Ke1
144. Be6 Kf1 145. Bd5 Nh3 146. Bh4 Ng1 147. Bb7 Nh3
148. Kf3  1/2-1/2
and both engines autosaved the game as a DRAW!!
What happened? The 50 moves rule was reached!!

Here the complete pgn-notation (with notes from Fritz6-side):

[Event "Masters Turnier"]
[Site "Wattenscheid"]
[Date "2001.09.08"]
[Round "4"]
[White "Chess Tiger 14.0"]
[Black "Fritz 6"]
[ECO "E14"]
[Result "1-0"]

1. d4 {0} Nf6 {0} 2. Nf3 {0} e6 {0} 3. c4 {0} b6 {0} 4. e3
{0} Bb7 {0} 5. Bd3 {0} Be7 {0} 6. O-O {0} c5 {0} 7. b3 {0}
cxd4 {0} 8. Nxd4 {letzter Buchzug 177} O-O {0.09/14 189}
9. Bb2 {198} d5 {0.09/14 175} 10. Nd2 {449} Nbd7 { 0.09/13
147} 11. Rc1 {165} Rc8 {0.03/13 182} 12. Bb1 {435} Bb4 {
-0.13/12 238} 13. cxd5 {216} Rxc1 {0.06/13 339} 14. Qxc1
{279} Bxd5 {0.09/13 222} 15. a3 {278} Bxd2 {0.12/14 281}
16. Qxd2 {26} Qa8 { 0.06/14 158} 17. f3 {295} e5 {0.12/15
223} 18. e4 {163} exd4 { 0.28/15 241} 19. exd5 {30} Qxd5
{0.22/15 194} 20. Bc2 {318} Rc8 { 0.28/14 184} 21. Rc1
{392} Re8 {0.22/14 262} 22. Qxd4 {146} Qg5 { 0.28/14 239}
23. g3 {136} a6 {0.12/13 147} 24. Bd3 {205} a5 { 0.25/13
210} 25. f4 {764} Qh5 {0.31/14 279} 26. b4 {165} axb4 {
0.37/12 155} 27. axb4 {130} h6 {0.53/14 273} 28. Bf1 {127}
Qf5 { 0.47/14 286} 29. Bc4 {131} Qh5 {0.56/14 410} 30. Qd2
{697} Ng4 { 0.47/13 171} 31. h3 {106} Ngf6 {0.56/14 241}
32. Kg2 {113} Qg6 { 0.62/13 138} 33. Qd4 {116} Ne4 {0.59/13
242} 34. g4 {251} Ndf6 { 0.78/13 270} 35. Kh2 {276} Nxg4+
{0.56/13 360} 36. hxg4 {130} Qxg4 {0.41/12 85} 37. Rc2 {84}
Qg3+ {0.19/12 100} 38. Kh1 {0} Nd6 { 0.00/13 234} 39. Re2
{143} Rxe2 {0.00/14 213} 40. Bxe2 {166} Nf5 { 0.00/13 65}
41. Qd8+ {91} Kh7 {0.00/7 0} 42. Qd3 {113} g6 { 0.00/14 81}
43. Qf3 {84} Qe1+ {0.06/14 78} 44. Kh2 {90} Qxb4 { 0.00/14
127} 45. Bc3 {87} Qb3 {0.09/13 88} 46. Qc6 {153} Qc2 {
-0.03/14 228} 47. Qc4 {89} Nd6 {0.00/15 72} 48. Qd3 {70}
Qxd3 { 0.00/16 93} 49. Bxd3 {23} Nf5 {0.28/16 87} 50. Be5
{88} Kg8 { 0.84/16 68} 51. Bc7 {75} Ne3 {1.09/17 76}
52. Kg3 {142} Nd5 { 0.97/16 65} 53. Be5 {162} Kf8 {1.00/15
52} 54. Be4 {128} Ne7 { 1.03/16 82} 55. Bc7 {70} b5
{1.03/16 155} 56. Bd3 {144} Nf5+ { 1.03/15 47} 57. Kh3 {61}
Ke7 {1.00/16 47} 58. Bxb5 {15} Nd6 { 1.09/15 70} 59. Bd3
{59} f5 {1.09/15 45} 60. Kh4 {108} Ke6 { 1.09/15 61}
61. Bc2 {73} Ne4 {1.12/15 42} 62. Bb8 {95} Nf6 { 0.87/15
64} 63. Bd1 {84} Kd5 {0.87/15 77} 64. Bb3+ {46} Ke4 {
1.00/17 65} 65. Bf7 {44} Nh5 {1.03/17 44} 66. Bxg6 {49}
Nxf4 { 1.25/17 97} 67. Bh7 {68} Ne6 {1.03/16 68} 68. Bd6
{39} Ng5 { 1.09/16 70} 69. Bg6 {40} Nf3+ {1.09/15 48}
70. Kh5 {36} Ne5 { 1.03/16 29} 71. Bh7 {35} Ng4 {1.06/16
56} 72. Kh4 {34} Nf6 { 1.28/16 34} 73. Bg6 {31} Ng4
{1.47/16 58} 74. Bf8 {32} Ne5 { 1.56/16 86} 75. Bh7 {52}
Ng4 {1.59/16 68} 76. Bg7 {29} Kf4 { 1.72/16 31} 77. Kh5
{65} Ke4 {1.50/17 48} 78. Bc3 {42} Kd3 { 1.50/17 46}
79. Bh8 {42} Ke4 {1.53/17 45} 80. Bg7 {41} Kf4 { 1.41/16
23} 81. Kh4 {22} Ne3 {1.69/16 34} 82. Bxh6+ {25} Kf3 {
1.84/16 42} 83. Kh3 {28} Ng4 {1.72/16 20} 84. Bg5 {35} f4 {
1.78/16 20} 85. Bf5 {22} Ne5 {1.84/16 38} 86. Bf6 {34} Nc4
{ 1.91/15 23} 87. Bd3 {26} Nd2 {1.81/15 20} 88. Ba6 {19}
Ne4 { 1.94/15 20} 89. Bd8 {16} Nc5 {1.94/15 16} 90. Bb5
{28} Ke4 { 2.19/14 21} 91. Bc6+ {14} Kf5 {2.19/14 27}
92. Bb6 {14} Ne6 { 2.28/15 19} 93. Bd7 {11} Ke5 {2.91/16
16} 94. Kg4 {15} Kf6 { 3.47/15 13} 95. Bc8 {14} Ke5 {#73/15
4} 96. Ba7 {11} Kd6 {#71/11 0} 97. Kf5 {0} Nc7 {#70/7 0}
98. Kxf4 {0} Nd5+ {#69/6 0} 99. Kf3 {0} Ke5 {#68/6 0}
100. Bb7 {0} Nc3 {#67/6 0} 101. Ke3 {0} Nd5+ {#66/6 0}
102. Kd3 {0} Nf4+ {#65/6 0} 103. Kc4 {0} Ke6 {#64/6 0}
104. Bb8 {0} Kf5 {#63/6 0} 105. Bc6 {0} Nh5 {#62/6 0}
106. Kd4 {0 } Nf6 {#61/6 0} 107. Bg2 {0} Ke6 {#60/6 0}
108. Bh3+ {0} Ke7 {#59/6 0} 109. Ba7 {0} Nd7 {#58/6 0}
110. Kd5 {0} Nf6+ { #57/6 0} 111. Ke5 {0} Kf7 {#56/6 0}
112. Bd4 {0} Ne8 {#55/6 0} 113. Bf5 {0} Nf6 {#54/6 0}
114. Bc2 {0} Ne8 {#53/6 0} 115. Bb3+ { 0} Kg6 {#52/6 0}
116. Kf4 {0} Ng7 {#51/6 0} 117. Kg4 {0} Ne8 {#50/6 0}
118. Bc2+ {0} Kf7 {#49/6 0} 119. Kg5 {0} Ke6 { #48/6 0}
120. Bb3+ {0} Kd6 {#47/6 0} 121. Bf2 {0} Nc7 {#46/6 0}
122. Bg3+ {0} Kc6 {#45/6 0} 123. Ba4+ {0} Kb6 {#44/6 0}
124. Kf5 {0} Nb5 {#43/6 0} 125. Bf2+ {0} Ka5 {#42/6 0}
126. Bb3 {0} Kb4 {#41/6 0} 127. Be6 {0} Kc3 {#40/6 0}
128. Ke4 {0} Kb4 { #39/6 0} 129. Bg8 {0} Nd6+ {#38/6 0}
130. Kd5 {0} Nc4 {#37/6 0} 131. Bf7 {0} Kc3 {#36/6 0}
132. Bd4+ {0} Kb4 {#35/6 0} 133. Bf6 { 0} Nd2 {#34/6 0}
134. Bg6 {0} Nf3 {#33/6 0} 135. Bd8 {0} Nd2 {#32/6 0}
136. Bh4 {0} Kb3 {#31/6 0} 137. Kc5 {0} Nf3 { #30/6 0}
138. Bf6 {0} Ng1 {#29/6 0} 139. Bh5 {0} Kc2 {#28/6 0}
140. Kd4 {0} Kd2 {#27/6 0} 141. Bg5+ {0} Ke1 {#26/6 0}
142. Ke3 { 0} Kf1 {#25/6 0} 143. Bg4 {0} Ke1 {#24/6 0}
144. Be6 {0} Kf1 {#23/6 0} 145. Bd5 {0} Nh3 {#22/6 0}
146. Bh4 {0} Ng1 { #21/6 0} 147. Bb7 {0} Nh3 {#20/6 0}
148. Kf3 {1} 1-0

(Chess Tiger won the match 7,5-2,5)

Regards
Michael

<a href="http://members.tripod.de/Michaels_Schachpage" target="_blank">Michaels
Schachpage</a>
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